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Thu, 31 Jul 2025 16:19:39 -0700 (PDT) From: Deepak Gupta Date: Thu, 31 Jul 2025 16:19:17 -0700 Subject: [PATCH v19 07/27] riscv/mm: manufacture shadow stack pte MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250731-v5_user_cfi_series-v19-7-09b468d7beab@rivosinc.com> References: <20250731-v5_user_cfi_series-v19-0-09b468d7beab@rivosinc.com> In-Reply-To: <20250731-v5_user_cfi_series-v19-0-09b468d7beab@rivosinc.com> To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Paul Walmsley , Palmer Dabbelt , Albert Ou , Conor Dooley , Rob Herring , Krzysztof Kozlowski , Arnd Bergmann , Christian Brauner , Peter Zijlstra , Oleg Nesterov , Eric Biederman , Kees Cook , Jonathan Corbet , Shuah Khan , Jann Horn , Conor Dooley , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Andreas Hindborg , Alice Ryhl , Trevor Gross , Benno Lossin Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, alistair.francis@wdc.com, richard.henderson@linaro.org, jim.shu@sifive.com, andybnac@gmail.com, kito.cheng@sifive.com, charlie@rivosinc.com, atishp@rivosinc.com, evan@rivosinc.com, cleger@rivosinc.com, alexghiti@rivosinc.com, samitolvanen@google.com, broonie@kernel.org, rick.p.edgecombe@intel.com, rust-for-linux@vger.kernel.org, Zong Li , Deepak Gupta X-Mailer: b4 0.13.0 X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: CB98340007 X-Stat-Signature: d784ba3ebhptr1s84s4anh59sufku47w X-HE-Tag: 1754003980-575701 X-HE-Meta: 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 SnjYgJLC 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This patch implements creating shadow stack pte (on riscv). Creating shadow stack PTE on riscv means that clearing RWX and then setting W=1. Reviewed-by: Alexandre Ghiti Reviewed-by: Zong Li Signed-off-by: Deepak Gupta --- arch/riscv/include/asm/pgtable.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index c0d7e67c67ff..792cb9792e8f 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -431,6 +431,11 @@ static inline pte_t pte_mkwrite_novma(pte_t pte) return __pte(pte_val(pte) | _PAGE_WRITE); } +static inline pte_t pte_mkwrite_shstk(pte_t pte) +{ + return __pte((pte_val(pte) & ~(_PAGE_LEAF)) | _PAGE_WRITE); +} + /* static inline pte_t pte_mkexec(pte_t pte) */ static inline pte_t pte_mkdirty(pte_t pte) @@ -776,6 +781,11 @@ static inline pmd_t pmd_mkwrite_novma(pmd_t pmd) return pte_pmd(pte_mkwrite_novma(pmd_pte(pmd))); } +static inline pmd_t pmd_mkwrite_shstk(pmd_t pte) +{ + return __pmd((pmd_val(pte) & ~(_PAGE_LEAF)) | _PAGE_WRITE); +} + static inline pmd_t pmd_wrprotect(pmd_t pmd) { return pte_pmd(pte_wrprotect(pmd_pte(pmd))); -- 2.43.0